Parse formal parameters.

dart/frog/leg/ssa/builder.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 class SsaBuilderTask extends CompilerTask {
   SsaBuilderTask(Compiler compiler) : super(compiler);
   String get name() => 'SSA builder';
 
   HGraph build(Node tree, Map<Node, Element> elements) {
     return measure(() {
@@ skipping 155 matching lines @@
   visitNodeList(NodeList node) {
     for (Link<Node> link = node.nodes; !link.isEmpty(); link = link.tail) {
       visit(link.head);
     }
   }
 
   visitOperator(Operator node) {
     compiler.unimplemented("SsaBuilder.visitOperator");
   }
 
-  visitParameter(Parameter node) {
-    compiler.unimplemented("SsaBuilder.visitParameter");
-  }
-
   visitReturn(Return node) {
     visit(node.expression);
     var value = pop();
     add(new HReturn(value));
     graph.setSuccessors(block, <HBasicBlock>[graph.exit]);
   }
 
   visitTypeAnnotation(TypeAnnotation node) {
     // We currently ignore type annotations for generating code.
   }
@@ skipping 13 matching lines @@
         Identifier id = init.receiver;
         Link<Node> link = init.arguments;
         assert(!link.isEmpty() && link.tail.isEmpty());
         visit(link.head);
         HInstruction initialValue = pop();
         definitions[elements[id]] = initialValue;
       }
     }
   }
 }